10.9.4 and TRIM

[couto27]

i tried the cindori trim enabler its a free version and its working.

Trim Enabler "cindori" version 3.2.3
Mac osx 10.9.4
SSD - transcend jetdrive 500 (jet drive toolbox can't enable trim after 10.9.3)

 

[MacOG728893]

I thought more recent SSD's have built in TRIM like functionality into their firmware?

 

[SandboxGeneral]

I thought more recent SSD's have built in TRIM like functionality into their firmware?

Some might, but to the best of my knowledge, you need a third-party TRIM enabler to work with OS X when using these non-Apple branded SSD's, like the Samsung ones.

 

[Weaselboy]

I thought more recent SSD's have built in TRIM like functionality into their firmware?

You are thinking of the built in garbage collection. Not quite the same thing as TRIM.

 

[MacOG728893]

You are thinking of the built in garbage collection. Not quite the same thing as TRIM.

Okay so what is the difference?

 

[w0lf]

Okay so what is the difference?

http://www.thessdreview.com/daily-n...ion-and-trim-in-ssds-explained-an-ssd-primer/

 

[davidlv]

Okay so what is the difference?

To get a full answer to that question, you will have to do some searching on Google, it is rather too much for a single post.
In short, garbage collection (GC) is firmware-based routines to erase the data on the chips so new data can be written. Each controller-firmware combination has differing routines for when and under what conditions the data is erased. Without Trim enabled, the SSD has no way of knowing which chips have been erased recently, so basically, Trim tells the SSD that it needs to do its routines on certain chips, which keeps the SSD functioning well. Of course, that is a very oversimplified explanation . Read some of the reviews on Anandtech, etc,
http://www.anandtech.com/tag/ssd
and you will get a lot of info on the differences between controllers and manufacturers, and how they handle GC and how Trim works to keep the SSD working at top speed and efficiency. Unless you have a very unique SSD, it is generally considered best to have Trim enabled.

 

[m4v3r1ck]

http://www.anandtech.com/show/6005/apples-new-ssd-its-fast

12GB is reserved for the Recovery partition, and I also suspect it's used as a buffer zone to prevent the SSD from being completely filled.

I received this reply:

Apple SSDs have been using fuzzy math since day one. Reported on http://www.xlr8yourmac.com and others.

SSD should and Samsung advises, to over provision / allocate (set aside) 11% for spare NAND cells (like you would have space sectors only SSDs don't use sectors, they use pages).

Falls - to me - into worrying about nothing but some spilled milk. I have a dozen by now of the Samsung 840s, and retired some older Intel and Corsair SSDs. Just use 'em. Folks don't like binary system of counting anymore so x'FF' and 1024 is now meaningless except to us old fuddies.

 

[MacOG728893]

http://www.thessdreview.com/daily-n...ion-and-trim-in-ssds-explained-an-ssd-primer/

To get a full answer to that question, you will have to do some searching on Google, it is rather too much for a single post.
In short, garbage collection (GC) is firmware-based routines to erase the data on the chips so new data can be written. Each controller-firmware combination has differing routines for when and under what conditions the data is erased. Without Trim enabled, the SSD has no way of knowing which chips have been erased recently, so basically, Trim tells the SSD that it needs to do its routines on certain chips, which keeps the SSD functioning well. Of course, that is a very oversimplified explanation . Read some of the reviews on Anandtech, etc,
http://www.anandtech.com/tag/ssd
and you will get a lot of info on the differences between controllers and manufacturers, and how they handle GC and how Trim works to keep the SSD working at top speed and efficiency. Unless you have a very unique SSD, it is generally considered best to have Trim enabled.

Interesting information! Thank you for the insightful posts

 

[mayuka]

Unless you have a very unique SSD, it is generally considered best to have Trim enabled.

I thought I've read on Anandtech that with recent SSDs enabling TRIM is obsolete now as the garbage collection got more sophisticated? Maybe you can clear things up. Since my Samsung 830 is not the latest model, I'll try to keep TRIM enabled, though.

 

[Mr. Retrofire]

I thought I've read on Anandtech that with recent SSDs enabling TRIM is obsolete now as the garbage collection got more sophisticated? Maybe you can clear things up. Since my Samsung 830 is not the latest model, I'll try to keep TRIM enabled, though.

The SSD firmware knows nothing about the filesystem (HFS+J for OS X; NTFS for Windows). That's the reason why the OS and the SSD firmware should support the TRIM command. The OS filesystem driver "knows", which parts of the filesystem contain no longer necessary (i.e. deleted) data.

 

[crjackson2134]

The SSD firmware knows nothing about the filesystem (HFS+J for OS X; NTFS for Windows). That's the reason why the OS and the SSD firmware should support the TRIM command. The OS filesystem driver "knows", which parts of the filesystem contain no longer necessary (i.e. deleted) data.

So if I'm understanding you correctly, TRIM is a messenger that says "Hey, the file system took this data out of it's index. Please clear that space and make it available for new data".

 

[SandboxGeneral]

So if I'm understanding you correctly, TRIM is a messenger that says "Hey, the file system took this data out of it's index. Please clear that space and make it available for new data".

Yep, that's about it.

 

[smithrh]

My OCZ (yes, I know, I know) SSD had instructions to specifically not turn on TRIM, and in fact when I tried to use Trim Enabler anyways, it failed. So, not all drives should be running TRIM, but the vast majority of them should.

(Once prices for the Samsung 850s stabilize I'll probably go in that direction and replace the OCZ; all of my other SSDs are Samsung 830s or 840s; note that for now the OCZ is actually the best performing SSD that I have)